21021332132 has 12 divisors (see below), whose sum is σ = 36795027276. Its totient is φ = 10508467200.

The previous prime is 21021332117. The next prime is 21021332141. The reversal of 21021332132 is 23123312012.

It can be written as a sum of positive squares in 2 ways, for example, as 11402822656 + 9618509476 = 106784^2 + 98074^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528113 + ... + 566520.

It is an arithmetic number, because the mean of its divisors is an integer number (3066252273).

Almost surely, 2^21021332132 is an apocalyptic number.

It is an amenable number.

21021332132 is a deficient number, since it is larger than the sum of its proper divisors (15773695144).

21021332132 is a wasteful number, since it uses less digits than its factorization.

21021332132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099438 (or 1099436 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21021332132 its reverse (23123312012), we get a palindrome (44144644144).

The spelling of 21021332132 in words is "twenty-one billion, twenty-one million, three hundred thirty-two thousand, one hundred thirty-two".